The present paper reports the preliminary results of an investigation of the dielectric properties in the frequency range of ~10-5 to 104 Hz, growth of water tree density and the spatial behavior of polarization in LDPE films aged in 0.1M NaCl solution for a time period <or=454 hours with an AC field of 6 kV/mm at 1 kHz at room temperature and at 65 degrees C by the laser intensity modulation method (LIMM).